Improvement in indicator for permutation-locks



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@tutti ANsoN HARDY, or Bos TON, MASSACHUSETTS.

Letters Patent No. 85,227, ma December 22, 186s.

IMPROVEIWENT IN INDICATOR FOR PERMUTATION-LQCKS.

The Schedule referred .to lin these Letters Patent and making part of the lame.

To all whom it 'ma/y conce/m:

Beit known that I, Anson HAnnY,`of Boston, in the county of Suffolk, and State of Massachusetts, have invented a new and useful Improvement in Locks; and I do hereby declare thatthe following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speciication, in whichi Figure 1 is a view of my improvement with a portion removed;

Figure 2, a view of the piece removed;

Figure 3, a section; and

Figure 4, a view (for illustration) of the portion of a lock on which my improvement is based.

My'invention relates to the improvement of indicators of locks, which can be opened only by a combinar tion or permutationof letters, figures, or other signs.

Fig. represents the indicator, as now commonly made, which is too well known to need description. In all such locks now made, the indicator is permanently attached to the lock, so that any onewho knows the combination has, at all times, thekey of the lock.

This combination (which is, so to speak, a mental key to the lock,) is, for security, communicated commonly to two or three persons, .for instance, to the cashier and president of a bank, either of `whom can, Y

`which is all that is required to open a door secured by the common combination-lock, one or more material keys (the detached indicator) are necessary in my lock.

Consequently, if thel detachedv indicator be made in separate pieces,` and one be given to each of the persons intrusted with a knowledge of the combination, neither can open the'lock without the knowledge and consent of the others.

The drawing shows this detachable indicator divided into three pieces, which is the number I prefer, though I do vnot wish to confine my claim to any particular number. 'These pieces, when properly put together," form an indicator not diii'erent, materially, from that .ofthe common combination-lock. Each piece, ofcourse, is so marked thatitcanlalways be put into its :proper place.'

differ from the well-known combination-lock, and therefore is not here described.

' These pieces must, of course, be so tted to the knobv that they will turn with it, and have no motion around it. In the drawing, this is accomplished by pins S S, which iit into corresponding holes inthe knob.

In the drawings- A represents the knob.

B 'represents the-plate in which it turns. Dj Dz D, the detachable indicators.

a a, c are recesses, whichatford ameans for taking hold of the pieces in order to detach them.

Having thus described my invention,

What I claim as new, and'desire to secure by Letters Patent, is

The detachable indicator for combination-locks, con-` structed in two or more parts, as and for the purpose described. l

^ ANSON- HARDY.

Witnesses: J. E. M AYNADIEB, J AMES DAMnmRs.

When these pieces are in place, the lock does notl 

